986
FNCA52 TJSJ 100730
FWFSJU
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO
NATIONAL WEATHER SERVICE SAN JUAN PR
330 AM AST FRI JUL 10 2026
DISCUSSION
PERSISTENT RAINFALL DEFICITS, CRITICALLY DRY FUELS, AND ELEVATED
KBDI VALUES CONTINUE ACROSS MUCH OF PUERTO RICO AND THE U.S.
VIRGIN ISLANDS, WITH THE GREATEST CONCERNS ACROSS SOUTHERN PUERTO
RICO, VIEQUES, CULEBRA, AND ST. CROIX. A DRIER-THAN-NORMAL AIR
MASS, MODERATE TO LOCALLY HIGH CONCENTRATIONS OF SAHARAN DUST,
AND BREEZY TO WINDY EASTERLY TRADE WINDS WILL CONTINUE TO SUPPORT
FAVORABLE CONDITIONS FOR WILDFIRE GROWTH AND SPREAD THROUGH THE
WEEKEND. FIRE WEATHER CONCERNS WILL REMAIN ELEVATED TO LOCALLY
CRITICAL AS LOW HUMIDITY AND GUSTY WINDS PERSIST. A FIRE DANGER
STATEMENT HAS BEEN ISSUED TODAY, AND ADDITIONAL FIRE WEATHER
PRODUCTS MAY BE NEEDED THROUGH THE WEEKEND.
PRZ014-102000-
SOUTHEAST COASTAL PLAINS-
330 AM AST FRI JUL 10 2026
TODAY TONIGHT SAT
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE NONE NONE NONE
CHANCE PRECIP (%) 0 0 0
TEMP (24H TREND) 93 (+3) 74 (-3) 94
RH % (24H TREND) 43 (-14) 85 (+3) 40
WIND 20FT/EARLY(MPH) E 19 G27 E 14 E 20 G28
WIND 20FT/LATE(MPH) E 23 G32 NE 14 E 21 G30
MIXING HGT(FT-AGL/MSL)4360 4960
TRANSPORT WND (MPH) E 23 E 22
VENT RATE (KT-FT) 87200 94240
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ015-102000-
SOUTHERN HILLS-
330 AM AST FRI JUL 10 2026
TODAY TONIGHT SAT
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE NONE SHOWERS SHOWERS
CHANCE PRECIP (%) 0 0 0
TEMP (24H TREND) 90 (+5) 71 (-3) 90
RH % (24H TREND) 52 (-17) 94 (+4) 51
WIND 20FT/EARLY(MPH) E 18 NE 16 E 16
WIND 20FT/LATE(MPH) E 21 NE 16 E 17
MIXING HGT(FT-AGL/MSL)4670 5350
TRANSPORT WND (MPH) E 21 E 21
VENT RATE (KT-FT) 84060 96300
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ016-102000-
NORTH COASTAL PLAINS-
330 AM AST FRI JUL 10 2026
TODAY TONIGHT SAT
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 10 0
TEMP (24H TREND) 92 (+2) 75 (-2) 90
RH % (24H TREND) 56 (-11) 93 (+3) 58
WIND 20FT/EARLY(MPH) E 19 E 20 E 18
WIND 20FT/LATE(MPH) NE 23 E 16 E 20
MIXING HGT(FT-AGL/MSL)4400 4930
TRANSPORT WND (MPH) E 22 E 24
VENT RATE (KT-FT) 83600 103530
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ017-102000-
NORTHERN HILLS-
330 AM AST FRI JUL 10 2026
TODAY TONIGHT SAT
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS NONE SHOWERS
CHANCE PRECIP (%) 10 0 10
TEMP (24H TREND) 91 (+2) 72 (-2) 89
RH % (24H TREND) 55 (-11) 95 (+2) 58
WIND 20FT/EARLY(MPH) E 18 E 18 E 17
WIND 20FT/LATE(MPH) NE 23 E 13 NE 19
MIXING HGT(FT-AGL/MSL)5180 5320
TRANSPORT WND (MPH) E 18 E 18
VENT RATE (KT-FT) 82880 85120
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ018-102000-
WEST COAST-
330 AM AST FRI JUL 10 2026
TODAY TONIGHT SAT
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS NONE SHOWERS
CHANCE PRECIP (%) 10 0 10
TEMP (24H TREND) 94 (+2) 72 (-3) 94
RH % (24H TREND) 55 (-10) 93 (+1) 54
WIND 20FT/EARLY(MPH) E 17 E 18 E 16
WIND 20FT/LATE(MPH) E 20 NE 17 E 18
MIXING HGT(FT-AGL/MSL)4240 5030
TRANSPORT WND (MPH) E 12 E 12
VENT RATE (KT-FT) 42400 50300
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ019-102000-
EASTERN INTERIOR-
330 AM AST FRI JUL 10 2026
TODAY TONIGHT SAT
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 20 10
TEMP (24H TREND) 90 (+3) 73 (-3) 89
RH % (24H TREND) 57 (-12) 93 (+2) 57
WIND 20FT/EARLY(MPH) E 18 E 16 E 16
WIND 20FT/LATE(MPH) E 23 E 16 E 14
MIXING HGT(FT-AGL/MSL)4520 5200
TRANSPORT WND (MPH) E 22 E 21
VENT RATE (KT-FT) 85880 93600
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ022-102000-
LUQUILLO MOUNTAIN RANGE-
330 AM AST FRI JUL 10 2026
TODAY TONIGHT SAT
CLOUD COVER MCLEAR PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 20 20
TEMP (24H TREND) 85 (+4) 70 (-3) 85
RH % (24H TREND) 65 (-14) 97 (+4) 65
WIND 20FT/EARLY(MPH) E 18 E 12 E 13
WIND 20FT/LATE(MPH) E 21 E 12 E 13
MIXING HGT(FT-AGL/MSL)3930 4920
TRANSPORT WND (MPH) E 22 E 23
VENT RATE (KT-FT) 74670 98400
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ023-102000-
CENTRAL MOUNTAIN RANGE-
330 AM AST FRI JUL 10 2026
TODAY TONIGHT SAT
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS NONE SHOWERS
CHANCE PRECIP (%) 0 0 10
TEMP (24H TREND) 90 (+6) 68 (-3) 88
RH % (24H TREND) 54 (-19) 97 (+3) 57
WIND 20FT/EARLY(MPH) E 17 E 13 E 11
WIND 20FT/LATE(MPH) E 19 E 12 E 14
MIXING HGT(FT-AGL/MSL)6090 6600
TRANSPORT WND (MPH) E 14 E 14
VENT RATE (KT-FT) 73080 79200
DISPERSION 5 5
DSI 6 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ024-102000-
CAYEY MOUNTAIN RANGE-
330 AM AST FRI JUL 10 2026
TODAY TONIGHT SAT
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 20 10
TEMP (24H TREND) 85 (+3) 70 (-3) 85
RH % (24H TREND) 64 (-13) 97 (+1) 62
WIND 20FT/EARLY(MPH) E 17 E 13 E 13
WIND 20FT/LATE(MPH) E 20 E 13 E 14
MIXING HGT(FT-AGL/MSL)4270 4830
TRANSPORT WND (MPH) E 24 E 23
VENT RATE (KT-FT) 89670 96600
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ025-102000-
VIEQUES-
330 AM AST FRI JUL 10 2026
TODAY TONIGHT SAT
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE NONE SHOWERS SHOWERS
CHANCE PRECIP (%) 0 10 10
TEMP (24H TREND) 90 (+1) 77 (-2) 89
RH % (24H TREND) 57 (-7) 86 (+2) 56
WIND 20FT/EARLY(MPH) E 18 E 19 E 18
WIND 20FT/LATE(MPH) E 18 E 19 E 17
MIXING HGT(FT-AGL/MSL)3970 4220
TRANSPORT WND (MPH) E 24 E 24
VENT RATE (KT-FT) 83370 88620
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ026-102000-
CULEBRA-
330 AM AST FRI JUL 10 2026
TODAY TONIGHT SAT
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE NONE SHOWERS SHOWERS
CHANCE PRECIP (%) 0 10 10
TEMP (24H TREND) 91 (+2) 78 (-2) 91
RH % (24H TREND) 58 (-10) 88 (+3) 57
WIND 20FT/EARLY(MPH) E 18 E 18 E 17
WIND 20FT/LATE(MPH) E 17 E 18 E 17
MIXING HGT(FT-AGL/MSL)3720 4090
TRANSPORT WND (MPH) E 23 E 24
VENT RATE (KT-FT) 74400 85890
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ027-102000-
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-
330 AM AST FRI JUL 10 2026
TODAY TONIGHT SAT
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE NONE NONE SHOWERS
CHANCE PRECIP (%) 0 0 0
TEMP (24H TREND) 94 (+3) 75 (-2) 94
RH % (24H TREND) 43 (-13) 83 (+2) 41
WIND 20FT/EARLY(MPH) E 19 G26 E 17 E 20 G29
WIND 20FT/LATE(MPH) E 23 G31 E 13 E 25 G34
MIXING HGT(FT-AGL/MSL)4380 5210
TRANSPORT WND (MPH) E 23 E 20
VENT RATE (KT-FT) 87600 88570
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ001-102000-
SAINT THOMAS AND SAINT JOHN-
330 AM AST FRI JUL 10 2026
TODAY TONIGHT SAT
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE NONE SHOWERS SHOWERS
CHANCE PRECIP (%) 0 10 10
TEMP (24H TREND) 88 (+2) 77 (-2) 88
RH % (24H TREND) 62 (-8) 89 (+4) 61
WIND 20FT/EARLY(MPH) E 19 G26 E 19 E 17
WIND 20FT/LATE(MPH) E 18 E 19 E 17
MIXING HGT(FT-AGL/MSL)3680 3790
TRANSPORT WND (MPH) E 24 E 24
VENT RATE (KT-FT) 77280 79590
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ002-102000-
ST CROIX-
330 AM AST FRI JUL 10 2026
TODAY TONIGHT SAT
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE NONE NONE SHOWERS
CHANCE PRECIP (%) 0 0 10
TEMP (24H TREND) 89 (+2) 77 (-2) 89
RH % (24H TREND) 60 (-9) 87 (+1) 60
WIND 20FT/EARLY(MPH) E 19 E 19 G26 E 19
WIND 20FT/LATE(MPH) E 18 E 19 E 17
MIXING HGT(FT-AGL/MSL)4460 5200
TRANSPORT WND (MPH) E 26 E 24
VENT RATE (KT-FT) 102580 109200
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
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